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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

Texas Instruments SN74LVC126APWRQ1

Name: SN74LVC126APWRQ1
Brand: Texas Instruments
SKU: SN74LVC126APWRQ1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LVC126APWRQ1

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: SN74LVC126APWRQ1.pdf

Description:: AUTOMOTIVE FOUR-CHANNEL 1.65V TO

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Product details

Overview

SN74LVC126APWRQ1 from Texas Instruments is an automotive-qualified quadruple bus buffer gate with 3-state outputs, designed for 1.65V–3.6V V_CC operation, supporting 5.5V-tolerant inputs and delivering ≤4.7ns propagation delay at 3.3V. It enables bidirectional signal isolation in automotive infotainment data buses and ADAS sensor interface modules.

For engineers reviewing the SN74LVC126APWRQ1 datasheet, SN74LVC126APWRQ1 pinout, SN74LVC126APWRQ1 application, or SN74LVC126APWRQ1 equivalent, key selection criteria include 3-state output timing (t_pd, t_en, t_dis), 5.5V input tolerance across 1.65V–3.6V supply range, automotive temperature rating (–40°C to +125°C), and TSSOP-14 package thermal performance (R_θJA = 150.8°C/W).

Technical Context

This device implements four independent non-inverting buffers, each with dedicated active-high output-enable (OE) control. Each buffer transitions to high-impedance state when its OE is low, enabling bus sharing without contention. Input logic thresholds scale with V_CC (VIH = 0.65×V_CC min at 1.65V; VIH = 2.0V min at 3.6V), ensuring robust noise immunity across voltage rails.

It features 5.5V-tolerant inputs regardless of V_CC, allowing direct interfacing between 3.3V logic and legacy 5V systems. Output drive strength scales with supply: I_OL = 24mA / I_OH = –24mA at V_CC = 3.0V, while maintaining <0.8V ground bounce (V_OLP) and >2.0V VOH undershoot (V_OHV) at 3.3V/25°C - critical for signal integrity in high-speed automotive serial links.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	1.65V to 3.6V - supports mixed-voltage system integration including 2.5V, 3.3V, and 1.8V domains.
Input Voltage Tolerance	Up to 5.5V - enables direct connection to 5V peripherals without level-shifting circuitry.
Max Propagation Delay	4.7ns at V_CC = 3.3V - ensures sub-5ns timing margin for 100+ MHz digital control paths.
Output Drive Strength	±24mA at V_CC = 3.0V - sufficient to drive 50Ω transmission lines or multiple LVC loads.
Operating Temperature	–40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and cockpit electronics.
ESD Rating	±2000V HBM - meets automotive ESD robustness requirements for assembly and field operation.
Power Dissipation Capacitance	22pF per gate (enabled), 4pF (disabled) - minimizes dynamic power in always-on vehicle networks.

Pinout & Package

TSSOP-14 (PW) package: 5mm × 6.4mm body size, 1.2mm max height, lead pitch 0.65mm, exposed thermal pad connected to GND for enhanced thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	1OE, 2OE, 3OE, 4OE	Active-high output enable controls - each independently disables one buffer's output to high-Z state.
2, 5, 9, 12	1A, 2A, 3A, 4A	Buffer input terminals - accept 5.5V-tolerant signals across full V_CC range.
3, 6, 8, 11	1Y, 2Y, 3Y, 4Y	Non-inverting buffered outputs - drive downstream logic or bus segments with 3-state capability.
7	GND	Ground reference - must be connected to PCB ground plane; thermal pad also tied to GND.
14	V_CC	Primary power supply - bypassed with 0.1µF capacitor placed within 2mm of pin for noise suppression.

Key Features

Feature	Design Value
Automotive qualification	AEC-Q100 Grade 1 compliant - validated for continuous operation from –40°C to +125°C ambient.
5.5V-tolerant inputs	Operates with VI up to 5.5V regardless of V_CC (1.65V–3.6V) - eliminates external level shifters in mixed-voltage clusters.
Low ground bounce	V_OLP < 0.8V at V_CC = 3.3V - reduces simultaneous switching noise in multi-buffer configurations.
Fast 3-state enable/disable	t_en ≤ 5.7ns, t_dis ≤ 6.0ns at V_CC = 3.3V - enables precise bus arbitration timing in time-critical protocols.
Latch-up immunity	>250mA per JESD17 - prevents destructive latch-up during transient overvoltage events in automotive environments.

Applications

Automotive Infotainment Data Bus	ADAS Sensor Interface Hub
Use Scenario: Isolating and buffering I²C or SPI signals between head unit MCU and display/touch controller in a 3.3V domain. IC Role / Device Role / Timing Role: Bidirectional bus buffer with 3-state control, enabling shared bus access among multiple peripherals. Use Value: 5.5V-tolerant inputs allow direct connection to legacy 5V audio codecs; sub-5ns t_pd preserves timing margins in 10MHz+ I²C Fast Mode Plus.	Use Scenario: Level-translating and isolating camera sensor parallel data lanes (e.g., MIPI D-PHY Rx side) before FPGA preprocessing. IC Role / Device Role / Timing Role: Non-inverting buffer with independent OE control per channel, synchronizing lane enable with frame strobes. Use Value: ±24mA drive strength supports 50Ω trace termination; R_θJA = 150.8°C/W enables stable operation in compact camera module PCBs.
Body Control Module (BCM) Signal Router	Electric Power Steering (EPS) Diagnostic Port
Use Scenario: Multiplexing LIN or CAN transceiver status signals onto a shared diagnostic bus inside the BCM housing. IC Role / Device Role / Timing Role: Quad 3-state buffer enabling software-selectable routing of fault indicators and sensor feedback. Use Value: AEC-Q100 qualification ensures reliability under engine bay thermal cycling; 125°C operation supports placement near power relays.	Use Scenario: Buffering UDS (Unified Diagnostic Services) communication lines between EPS ECU and service tool connector. IC Role / Device Role / Timing Role: High-impedance isolation gate preventing backfeed during ECU reprogramming or firmware updates. Use Value: <0.8V ground bounce limits noise coupling into sensitive motor current sensing circuits; ±2000V HBM withstands shop-floor ESD events.

Automotive Infotainment Data Bus

ADAS Sensor Interface Hub

Use Scenario: Isolating and buffering I²C or SPI signals between head unit MCU and display/touch controller in a 3.3V domain.

IC Role / Device Role / Timing Role: Bidirectional bus buffer with 3-state control, enabling shared bus access among multiple peripherals.

Use Value: 5.5V-tolerant inputs allow direct connection to legacy 5V audio codecs; sub-5ns t_pd preserves timing margins in 10MHz+ I²C Fast Mode Plus.

Use Scenario: Level-translating and isolating camera sensor parallel data lanes (e.g., MIPI D-PHY Rx side) before FPGA preprocessing.

IC Role / Device Role / Timing Role: Non-inverting buffer with independent OE control per channel, synchronizing lane enable with frame strobes.

Use Value: ±24mA drive strength supports 50Ω trace termination; R_θJA = 150.8°C/W enables stable operation in compact camera module PCBs.

Body Control Module (BCM) Signal Router

Electric Power Steering (EPS) Diagnostic Port

Use Scenario: Multiplexing LIN or CAN transceiver status signals onto a shared diagnostic bus inside the BCM housing.

IC Role / Device Role / Timing Role: Quad 3-state buffer enabling software-selectable routing of fault indicators and sensor feedback.

Use Value: AEC-Q100 qualification ensures reliability under engine bay thermal cycling; 125°C operation supports placement near power relays.

Use Scenario: Buffering UDS (Unified Diagnostic Services) communication lines between EPS ECU and service tool connector.

IC Role / Device Role / Timing Role: High-impedance isolation gate preventing backfeed during ECU reprogramming or firmware updates.

Use Value: <0.8V ground bounce limits noise coupling into sensitive motor current sensing circuits; ±2000V HBM withstands shop-floor ESD events.

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC125A-Q1	Active-low OE (1G, 2G, etc.) instead of active-high OE; identical electrical specs and pinout except OE polarity.	Requires inverted enable logic from host MCU; otherwise drop-in compatible in existing layouts using OE inversion in firmware or external inverter.	Select SN74LVC125A-Q1 only if system-level enable signaling is active-low; verify OE logic alignment before substitution.
SN74LVCH126A-Q1	Includes bus-hold circuitry on all inputs (no external pull-ups required); otherwise matches SN74LVC126APWRQ1 in speed, voltage, and packaging.	Reduces BOM count by eliminating 8 external 10kΩ pull-up resistors; slightly higher ICC (max 40μA vs. 20μA) in static conditions.	Prefer SN74LVCH126A-Q1 for floating-input-prone designs (e.g., hot-pluggable modules); confirm bus-hold current compatibility with source drivers.

Compared with SN74LVC126APWRQ1, SN74LVC125A-Q1 requires OE signal inversion but offers identical timing and drive, while SN74LVCH126A-Q1 adds bus-hold for input stability at modest ICC increase - both serve distinct design constraints without PCB changes.

Availability

SN74LVC126APWRQ1 is available at Aetrix Electronics and suitable for automotive infotainment data buses, ADAS sensor interface hubs, and body control module signal routing requiring stable component supply across extended temperature and long production lifecycles.

Supply support for SN74LVC126APWRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and automotive-grade ICs, with decades of automotive qualification expertise and AEC-Q100-compliant manufacturing.

The SN74LVC126A-Q1 belongs to TI's automotive logic portfolio, engineered specifically for signal integrity, voltage translation, and bus isolation in safety-critical vehicle subsystems operating from –40°C to +125°C.

FAQ

What is the maximum input voltage rating for SN74LVC126APWRQ1?

The SN74LVC126APWRQ1 supports input voltages up to 5.5V regardless of V_CC level (1.65V–3.6V), enabling direct interfacing with 5V peripherals without external level shifters. This specification is guaranteed per absolute maximum ratings and confirmed in Section 4.1 of the datasheet.

Does SN74LVC126APWRQ1 require external pull-up resistors on unused inputs?

Yes - all unused inputs of SN74LVC126APWRQ1 must be tied to V_CC or GND to prevent floating states that cause undefined logic behavior and increased ICC. TI recommends 10kΩ pull-up/down resistors; bus-hold variants (e.g., SN74LVCH126A-Q1) eliminate this requirement.

What is the thermal resistance (R_θJA) of SN74LVC126APWRQ1 in its TSSOP-14 package?

The SN74LVC126APWRQ1 in PW (TSSOP-14) package has a junction-to-ambient thermal resistance of 150.8°C/W, measured under standard JEDEC test conditions. This value assumes a two-layer PCB with 1-in² copper area and is critical for thermal design in enclosed automotive enclosures.

Can SN74LVC126APWRQ1 be used as a level translator between 1.8V and 3.3V domains?

Yes - SN74LVC126APWRQ1 operates down to 1.65V V_CC and accepts 5.5V-tolerant inputs, making it suitable for translating signals from 1.8V or 3.3V sources to a 3.3V bus. VIH/VIL thresholds scale with V_CC, ensuring reliable recognition of 1.8V logic highs when V_CC = 3.3V.

Is SN74LVC126APWRQ1 pin-compatible with non-automotive SN74LVC126A variants?

Yes - SN74LVC126APWRQ1 shares identical pinout, package dimensions, and electrical characteristics with commercial SN74LVC126APWR, differing only in AEC-Q100 qualification, extended temperature screening, and automotive-specific traceability. No PCB layout change is needed for upgrade.

SN74LVC126APWRQ1 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LVC

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 4

Number of Bits per Element:: 1

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 24mA, 24mA

Voltage - Supply:: 1.65V ~ 3.6V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TSSOP

SN74LVC126APWRQ1 FAQ

1.How can I place an order for SN74LVC126APWRQ1 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LVC126APWRQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for SN74LVC126APWRQ1 reliable?

The price and inventory of SN74LVC126APWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC126APWRQ1 is usually 5 days.

3.What payment methods are accepted for SN74LVC126APWRQ1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC126APWRQ1 transactions.

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4.How is shipping managed for SN74LVC126APWRQ1?

SN74LVC126APWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LVC126APWRQ1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for SN74LVC126APWRQ1?

For technical support, including SN74LVC126APWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC126APWRQ1 requirements.

6.How does Aetrix verify that SN74LVC126APWRQ1 is sourced from the original manufacturer or authorized distributors?

All SN74LVC126APWRQ1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74LVC126APWRQ1 meets industry standards.

7.What is the process for return or replacement of SN74LVC126APWRQ1?

All SN74LVC126APWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC126APWRQ1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The SN74LVC126APWRQ1 part is unused and in its original packaging.

Return procedure for SN74LVC126APWRQ1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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